Is there a disorder or something similar...?

He probably just has horrible Social skills, and uses those stories as a way to try and interact and be a part of the collective group. or it could be Pseudologia fantastica, mythomania, or pathological lying is one of several terms applied by psychiatrists to the behavior of habitual or compulsive lying. It was first described in the medical literature in 1891 by Anton Delbrueck. Although it is a controversial topic, one definition of pathological lying is the following: "Pathological lying is falsification entirely disproportionate to any discernible end in view, may be extensive and very complicated, and may manifest over a period of years or even a lifetime."